Not sure which model Kodak you have. But if it is a newer one, there may be a setting for ISO (which is the same as "film" speed) If your camera is set to automatic ISO and you take pictures in low light, it will increase your ISO value so that the picture has more light.
Increasing ISO, will increase the graininess in a photo. Soooo, if you have a picture taken with 2000 ISO, the bigger it is the more grain you will see.
The lower ISO value will give a clearer, sharper image depending on light sources. The better lighting you have, the lower you can go with ISO, but also depends on shutter speed and aperture size.
Hope this helps
